I am having trouble with my Soft Tub constantly cycling on and off. The thermostat will swing wildly, up 108 then back to 100, and I know the tub is only at 102-104 degrees. The tub with turn on for a few seconds and then cycle back off, only to do it again less than a minute later. Also, sometimes the thermostat resets to 100 degree without the GFI or breaker having been tripped. Does any one have any ideas about what might be going on. I have only had the tub for about 4 years, so it is pretty frustrating. Thanks!